Vizio 3642-1232-0150 Main Unit/Input/Signal Board 0171-2271-3276 Please order by the part # below to ensure compatibility. Ordering by board # or TV model # will not guarantee compatibility with your unit. Please contact us with any questions: 3642-1232-0150 Other Board #s and TV Model #s: 0171-2271-3276 E421VO LAQKIFDN E421VO LAUKIFDL